Memory loss associated with aging may involve more than the passage of time. Researchers at Virginia Tech identified specific molecular changes in the brain that are linked to weaker memory function.
The finding offers a different way to examine why memory can decline later in life. It also points to biological processes that may be studied as potential targets for future health research.
Older Mice Showed Memory Improvement
Researchers used CRISPR-based gene-editing technology to reset molecular activity in brain regions involved in memory. Adjusting those processes was reported to significantly improve memory performance and memory function in older mice.
One part of the work examined the IGF2 gene, which plays a role in memory formation. Its function can decline during aging because of DNA methylation, a chemical marking process that switches off genes.
Using CRISPR-dCas9, the team reactivated the IGF2 gene in aged mice. That reactivation was associated with a significant improvement in memory among the study subjects.
The timing of the intervention appeared to be crucial. When the same type of intervention was carried out in middle-aged subjects without memory impairment, the improvement was not significant.
Timothy Jarome, an associate professor in Virginia Tech’s College of Animal, Agricultural and Life Sciences, said the molecular changes can be investigated more directly. The research links memory decline to specific biological shifts that can be studied and targeted.
Two Memory Centers Changed in Opposite Directions
The team also focused on K63 polyubiquitination, a molecular process that regulates protein behavior inside brain cells. Under normal conditions, the process helps support communication between neurons and the formation of memories.
Aging did not produce the same change throughout the brain. The hippocampus and amygdala showed opposite shifts in K63 polyubiquitination activity.
| Brain Area | Role Mentioned in the Study | Change During Aging |
|---|---|---|
| Hippocampus | Memory center | K63 polyubiquitination activity increased |
| Amygdala | Emotional memory | K63 polyubiquitination activity decreased |
These contrasting changes may be connected to the development of memory problems. They indicate that memory decline can be shaped by mechanisms occurring within specific brain networks.
CRISPR was used to regulate K63 polyubiquitination again in the brain areas examined by the researchers. The reported improvement after those adjustments suggests that disrupted molecular activity may influence how memory functions in aging subjects.
Implications for Dementia Research
The study does not establish a treatment for dementia or for memory loss in humans. Its focus is on identifying biological mechanisms and showing how those mechanisms behaved in the research subjects.
Still, the results provide a basis for studying molecular triggers that may contribute to memory impairment. Understanding when changes begin may be as important as identifying the IGF2 gene or K63 polyubiquitination itself.
The findings place particular attention on the early onset of memory decline. Detecting that stage could be central to research seeking to regulate molecular processes linked to memory.
